alan.moore wrote:Simon, have you checked the fuel level as suggested, this will tell you if the jet block nuts is correct and also the fuel level which, if wrong, will effect the idle.
To a point yes, but I have not had time to make a fitting to go onto the drain port - do you happen to know what thread it is? I might make some sort of tapered plastic cone or something to take a bit of clear tube.
I've had a look through the inlet, down toward the needle jet - I can just see fuel there, but I suspect the fact that I cannot see fuel easily suggests it's low. It floods as normal, out of the overflow and out of the pilot passage.
I have it apart at the moment - I wanted to have a look at the pilot screw seat to make sure it is not mangled - the passages are all clear, but the pilot air screw does not seem to make any difference to the idle.
I'll get there.